Electrical alarm system.



A. GOLDSTEIN. ELECTRICAL ALARM SYSTEM, Arrmour'on rrr'mn IALZB, 1910.

a l' l' v I M m a5 Mavmm *?Ww Patented Aug. 9, 1910.

(UNITED STATES PgENTfQFFIQ IEROTECTION COMPANY, A CORPORATION OF NEW YORK,

ELIE(3"1LEtItLl-LL ALARM SYSTEM.

, Specification of Letters Patent.

Patented Aug 9, 1910.

Aunlication filed March 28, 1910. Serial No. 551,817. V

' To all whom it may concern:

Be it known that I, ALBERT Gonps'rnrn, a citizen of the United- States, resld-lng at New York, in the county ofNew York and State of New York, have invented a certain new and useful Improvement in Electrical Alarm Systems, of which the fiollowing is a specification I The invention relates to an electrical alarm system and has for its object the utilization of a telephone circuit also as a burglar alarm circuit,

At the transmitting or subscriber's station are arranged the usual telephonic transmitting devices, and also the protective circuit which may comprise a number of loops in series so as to extend to various localities-as, for example,-.w1ndows and doorsin a building which it is desired to protect. The protective circuit is in shunt from. the

1 main line circuit, and is normally closed.

When the telephone receiveris removed from its switch arm, the'closing of main circuit by said arm in the ordinary way, causes'a, magnet in said main circuit to become energized .from the distant or receiving station,-

paratus at said receiving station, but which,

by means of a suitable switch, may be brought intocircuit with the apparatus at 'the transmitting station, the connection of the said apparatus with the translating devices at the receiving stationbeing at the same time broken. Vh'enftherefore, the switch is thrown to connect the telephonic apparatus at the transmitting station with i the translating devices at the receiving star tion. the ordinary conditions of telephonictransmission are present,'with the addition that accidental breaks or disturbances on the line Wlll be indicated at the receiving station, When the switch is thrown to' contalking,

arms 10jthen being opened by the 'cutlolf 1 00 nect the telephonic apparatus'at the transmitting station with the independent'alarm circuit at the receiving station, then speech .transmissl on is prevented; but the protective circuit at the transmitting station is di- ALBERT GOLDSTEIN, OF NEW- YORK, N. Y., ASSIGNOR INTERNATIONAL: ELECTRIC rectly connected with said independent alarm circuit, so that any interruption of saidprotective circuit results in operating By v the alarm circuitto give an alarm. reason of tlns constructlon, a'telephone sub;

.scriber may, at any desired hour, notify histelephone; exchange that for some stated] periodof time he desires his telephone service cut off and burglar alarm made effective.

The operator at the exchange then simply throws the switch before noted,.and thereafter any tampering'with the subscribers protective circuit or abnormal condition on the line is at once announced by the alarm at said exchange. 7 5

The accompanying drawing is an electrlcal diagram, showlng the applicat on of my invention to a typical Bell telephone circuit.

The line circuit, .of which the members are shown at a, b, unitesthe subscribers sta- .ti'on"at A to thehentral ofiice at B. The

usual appar: us here shown at the, subscribers station includes-the hell 1, condenser 2, induction'coil 3,1'transmitter4, rev 5 ceive-r 5 and switch 6 controlled by there'- ceiver to open and close circuit'at' the ter minals of the induction coil" and with the;

transmitter in the ordinary way. The usual apparatus. herev indicated-atthe receiving station or central :ofiice. at B, includes'the battery 7 line relay 8, line lamp 9,'switches 10 of the cut ofl' relay, (not shown) jacks 11 (only one shown) and the cord circuit in shunt around thebattery,w hich cordcircuit includes two windings 12 of the repeating, coil, supervisory relay 13' and plug contacts l4,which contacts, when the subscriber is connect with any jack 11; switch and comprising aszmany loops in series as circumstances may demand. In connection with any or all of thes'e loops may be provided short-circuiting levers D, so that any loop may be manually cut out of circuit by the subscriber when and for as long, as .he 1 10 loop circuit C is to 8 is not-v energized magnet E, so that the magnet will not injuriously affect the speech'transmission.

'Said'circuit includes an alarm of any suitbattery k to a glow lamp Z.

circuits at r and r.

- at s, and lighting the lamp pl Magnet- J,

moves it's'switch c to open the protective "circontact at 1'. Magnet J then fails, so that .inthe usual way. This condition with remay desire. In the memberuz of the line i circuit is a magnet'E'which, by its switch lover 0, opens and closes the protective circuit-through the shunt conductor 0. A noninductive shunt fis provided around the At the central station is a switch H, by I means of which the line may be connected either to the telephonic translating devices at B, or'to\a separate alarm circuit .at I.

able type; here shown as agalvanometer coil vi connected to ground at" G and containing a balanced needle arm j which, when swung in eitherdirection, closes circuit from In the lead m of the main circuit at the receiving station whichconnects, to ound' G are two magnets J, J is a high resistance magnet and is normally energized by battery 7. The magnet K is to be constructed of sufficientlylowresistance as not to be energized by the current which energizes J. The resistance of magnet J and be such as that the relay by the normal current in the circuit; Magnet J controls switchn to open and close a local circuit including battery 0 and lamp. p, when switch arm 9 closes said circuit at. r. Switch arms g-and g are controlledbfmagnet ,K to open and close The e'fi'e'ct of closin circuitf'at 49" "is to 'short-circuit magnet Assuming, for illustration, that'the separate alarm circuit I is to be putinto operation only between certain designated hours; at other times the switch H is placed, as shown "in the drawing, "to'c'onnect' the subscribers transmitter with the telephonic apparatusat B. Magnet J being normally energized, moves its switch n1 to open circuit at s. Hence-any break orground on the line will causemagnet J .to fail, thus closing circuit therefore, keeps the circuit under automatic test. When the'subscriber removes his receiver 5 fr om the switch hook, a low resistance circuit is closed'between the members a, b of'the line, through transmitter 4:, hook switch 6, and onewinding of the in duction coil 3. This energizes magnets E and K and also relay 8. Magnet'E then cuit C. Magnet K moves its switch q to close contact at r, thus short-circuiting .magnet J, and also through'switch q opens the switch lever '11; closes contact at s, but because circuit. is broken at r,,its lam does not light. Relay .8 actuates its. switch to close circuitto operate the'line lamp 9,

spect to ma ets E, K and-J, is maintained from non-grounded of course,

apparatus -at said station as long as t e receiver is oif the hook, and

on its replacement the normal state of affairs is resumed. At the time fixed for-esat the central station is moved to close the alarm circuit I, and cut out the telephone apparatus at B. Circuit is then established pole of battery 76 by wire 6, to switch H, wire a, switch 6, by wire 0 to the subscribers protective circuit C, and so back by wire I) to switch H, wire t, coil 2' to ground G. The switch levers at D are, open. .Hence when any abnormal condition occurs on the alarm circuit C such as break, ground or crossing-the needle 7 is swung, and alarm is given by the lamp l at the central station.

. I claim':

l. The combination of a line circuit extending between distant stations, and at one station (A) telephonic receiving and transmitting devices, and a shunt protective circuit, and at the other station (B) telephonictranslating devices, a separate alarm circuit (I), and a switch: the aforesaid switch operating to connect the telephonic A either to the translating devicesor to the said separate alarm circuit at station B.

2. 'The combination of a line circuit extending between distant stations, and at one station mitting devices, a switch for making and breaking circuit to the same, a shunt protec tive circuit, and means controlled by said switch for controlling said protective circuit, and at the other station (B) telephonic translating devices, and a source of current energizing said controlling means.

3. The combination of a line circuit extending between distant stations, and at one station" (A) telephonic receiving and transmitting devices, a switch for making and breaking circuit to the same, a shunt protective circuit, and means for controlling said protective circuit, and at the other station (B) telephonic translating devices and a local alarm circuit, a source of current, and a switch: the said source of current energizing said protective circuit controllin means to close said circuit, and the sai switch operating to connect the telephonic apparatus and shunt protective circuit at said station Aeither to the translating devices or to the separate alarm circuit at station B.

-. 4. The combination of a line circuit eX- tending between distant stations, and at one station (B) telephonic translating devices, and a source of current, and at the other station (A) telephonic transmitting and receivlng devices, a normally closed shun't protective circuit, a magnet for opening sa1d circuit energized by said current source, and

a pivoted switch arm cont-rollin said means and itself controlled by the app ication to or removal therefrom of the telephone receiver.

(A) telephonic receiving and trans oceans 5. The combination of a line circuit extending between distant stations, and at one station (A) telephonic receiving and transmitting devices, and a shunt protective cir cuit, and at the other station (B) telephonic translating devices, a local alarm circuit associated therewith, a separate local alarm circuit, and a switch, the aforesaid switch connecting the telephonic devices and shunt protective circuit at said station A to said separate alarm circuit or to said translating devices at station B, means actuated by an abnormal change in electrical conditions on the line for operating said separate alarm circuit to give an alarm when connected by said switch to said apparatus at station A, and means similarly actuated for operating the other alarm circuit togive an alarm When said switch connects said other alarm circuit and said translating devices to said apparatus at station 15.

6. In combination with a telephone circuit including transmitting and "receiving apparatus,a normally energized magnet in said circuit, a local alarm circuit controlled by said magnet, and a second magnet controlled byabnormal variations in the cur rent on said circuit to short-circuit said first magnet and open said local alarm circuit.

In testimony whereof I have affixed my signature in presence of two witnesses.

ALBERT GOLDSTEIN.

Witnesses Gnn'rnnnn T. Poizrnn, MAY T. lNlCGARRY. 

